Description

The Cummins QSB6.7 550 HP Marine Diesel Engine is a powerful, efficient, and highly durable engine designed for demanding marine applications. With cutting-edge technology, it delivers impressive horsepower, exceptional fuel economy, and low emissions, making it an ideal choice for a variety of commercial and recreational vessels. Below is a detailed description of the Cummins QSB6.7 550 HP Marine Diesel Engine:

Key Features:

1. Engine Configuration:
   • Type: Inline 6-cylinder, 4-stroke diesel engine.
   • Displacement: 6.7 liters (409 cubic inches).
   • Bore x Stroke: 104 mm x 132 mm (4.09 inches x 5.20 inches).
   • Aspiration: Turbocharged and intercooled for enhanced air intake and combustion efficiency.
   • Engine Block: Designed with heavy-duty materials and construction for optimal performance and reliability in harsh marine environments.
2. Power Output:
   • Rated Power: 550 horsepower (hp) at 2,800 RPM.
   • Maximum Torque: Approximately 1,890 Nm (1,395 lb-ft) at 1,400 RPM.
   • The QSB6.7 engine provides a high power-to-weight ratio, making it ideal for high-performance applications such as fast cruising, towing, or workboat operations.
3. Fuel System:
   • Fuel Type: Diesel, optimized for marine use.
   • Fuel Delivery System: Common rail fuel injection technology, providing superior combustion efficiency, reduced emissions, and better fuel economy.
   • Fuel Efficiency: Designed for high fuel efficiency, helping to lower operational costs during long voyages or extended use.
4. Cooling System:
   • The QSB6.7 engine is equipped with a high-efficiency cooling system that utilizes a freshwater-based loop with seawater cooling for heat exchangers. This ensures optimal engine temperatures even during prolonged periods of operation in varying marine conditions.
5. Exhaust System:
   • Features an advanced exhaust gas recirculation (EGR) system and selective catalytic reduction (SCR) technology, ensuring compliance with strict emissions standards, including EPA Tier 3, IMO, and EU RCD regulations.
   • The marine-grade dry exhaust system enhances reliability and reduces engine wear by efficiently handling the exhaust gases in marine environments.
6. Turbocharging and Intercooling:
   • Turbocharged with an intercooler system, the QSB6.7 offers improved intake air density and combustion efficiency. The turbocharger boosts the engine’s power output, while the intercooler cools the compressed air to maximize engine performance and reduce the likelihood of knock or detonation.
7. Lubrication System:
   • The engine employs a wet sump lubrication system to ensure proper oil flow and consistent pressure, reducing friction and wear on critical engine components. The system helps to maintain high performance and long engine life, even in demanding conditions.
8. Control and Monitoring:
   • Electronic Control Module (ECM): The QSB6.7 is equipped with an ECM that optimizes fuel efficiency, enhances performance, and allows for comprehensive diagnostics and real-time monitoring of engine health.
   • Marine-Grade Digital Display: The engine integrates seamlessly with various marine electronics to provide operators with important information such as fuel consumption, engine load, coolant temperature, and more.
9. Dimensions and Weight:
   • Length x Width x Height: Approximately 1,078 mm x 789 mm x 1,053 mm (42.4 inches x 31 inches x 41.5 inches).
   • Weight: Around 1,110 kg (2,448 lbs), which offers a solid yet manageable weight for its power output, contributing to a high power-to-weight ratio.
10. Noise and Vibration Reduction:
    • Designed to minimize engine noise and vibration, the QSB6.7 ensures a quieter and more comfortable operation, which is especially beneficial for passenger vessels or recreational boats where comfort is a priority.
11. Maintenance and Service:
    • The QSB6.7 engine has been engineered for easy maintenance and serviceability, with accessible components and longer service intervals, helping to reduce downtime and operational costs.
    • Cummins Filtration Systems: The advanced filtration systems in place extend the life of engine components and maintain peak performance over time.
12. Environmental Compliance:
    • Meets global emissions standards, including EPA Tier 3, IMO, and EU RCD regulations, ensuring lower emissions and helping to protect the environment without compromising power or performance.
    • Advanced after-treatment systems, including EGR and SCR, reduce nitrogen oxide (NOx) and particulate matter (PM) emissions.

Applications:

The Cummins QSB6.7 550 HP Marine Diesel Engine is highly versatile and suitable for a wide range of marine applications, including:

• Commercial Vessels: Perfect for commercial workboats, including tugboats, offshore supply vessels, and transport vessels that need consistent power and reliability for everyday operations.
• Pleasure Craft/Boats: Ideal for high-performance yachts, cruisers, and sports fishing boats where speed, power, and efficiency are key factors.
• Fishing Boats: Well-suited for both recreational and professional fishing operations requiring robust power and endurance.
• Utility and Special Purpose Vessels: This engine is also used in vessels like tenders, offshore service boats, and other specialized applications that demand reliable performance and efficiency.

Performance Benefits:

• High Power and Torque: The engine’s 550 hp output ensures excellent performance, whether for high-speed cruising or heavy-duty commercial tasks, such as towing or hauling.
• Fuel Efficiency: The advanced fuel system ensures exceptional fuel economy, providing cost-effective operation over long distances.
• Emissions Compliance: The QSB6.7 is equipped with the latest emission-reduction technologies, making it suitable for operation in regions with stringent environmental regulations.
• Durability and Reliability: Designed for marine environments, the engine is built to endure prolonged use and harsh conditions, ensuring long-term serviceability with minimal downtime.
• Low Maintenance: Longer service intervals and the ease of maintenance keep operating costs down.

Summary:

The Cummins QSB6.7 550 HP Marine Diesel Engine delivers an outstanding combination of power, fuel efficiency, and environmental compliance for marine operators. Engineered for a wide range of applications, from commercial vessels to high-performance recreational boats, it provides reliable and efficient operation in even the most challenging conditions. With advanced features such as common rail fuel injection, turbocharging, and SCR technology, it is a top choice for those seeking a powerful, efficient, and environmentally-friendly marine engine solution.